/*
 * Copyright (C) 2006-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */

package org.alfresco.jlan.oncrpc.nfs;

import java.util.Enumeration;
import java.util.Hashtable;

/**
 * NFS Server Session Table Class
 *
 * @author gkspencer
 */
public class NFSSessionTable {

	//	Session list

	private Hashtable<Object, NFSSrvSession> m_sessions;

	/**
	 * Class constructor
	 */
	public NFSSessionTable() {
		m_sessions = new Hashtable<Object, NFSSrvSession>();
	}

	/**
	 * Return the number of sessions in the list
	 *
	 * @return int
	 */
	public final int numberOfSessions() {
		return m_sessions.size();
	}

	/**
	 * Add a session to the list
	 *
	 * @param sess NFSSrvSession
	 */
	public final void addSession(NFSSrvSession sess) {
		m_sessions.put(sess.getAuthIdentifier(), sess);
	}

	/**
	 * Find the session using the authentication identifier
	 *
	 * @param authIdent Object
	 * @return NFSSrvSession
	 */
	public final NFSSrvSession findSession(Object authIdent) {
		return m_sessions.get(authIdent);
	}

	/**
	 * Remove a session from the list
	 *
	 * @param sess NFSSrvSession
	 * @return NFSSrvSession
	 */
	public final NFSSrvSession removeSession(NFSSrvSession sess) {
		return removeSession(sess.getAuthIdentifier());
	}

	/**
	 * Remove a session from the list
	 *
	 * @param authIdent Object
	 * @return NFSSrvSession
	 */
	public final NFSSrvSession removeSession(Object authIdent) {

		//	Find the required session

		NFSSrvSession sess = findSession(authIdent);

		//	Remove the session and return the removed session

		m_sessions.remove(authIdent);
		return sess;
	}

	/**
	 * Enumerate the session ids
	 *
	 * @return Enumeration
	 */
	public final Enumeration enumerate() {
		return m_sessions.keys();
	}
}
